/* Copyright (C) 1991-2024 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

#include <setjmp.h>
#include <stdio.h>
#include <stdlib.h>

static jmp_buf env;
static int last_value = -1, lose = 0;

static __attribute__((__noreturn__)) void jump(int val) {
  longjmp(env, val);
}

int main(void) {
  int value;

  value = setjmp(env);
  if (value != last_value + 1) {
    fputs("Shouldn't have ", stdout);
    lose = 1;
  }
  last_value = value;
  switch (value) {
    case 0:
      puts("Saved environment.");
      jump(0);
    default:
      printf("Jumped to %d.\n", value);
      if (value < 10)
        jump(value + 1);
  }

  if (!lose && value == 10) {
    /* Do a second test, this time without `setjmp' being a macro.
       This is not required by ISO C but we have this for compatibility.  */
#undef setjmp
    extern int setjmp(jmp_buf);

    last_value = -1;
    lose = 0;

    value = setjmp(env);
    if (value != last_value + 1) {
      fputs("Shouldn't have ", stdout);
      lose = 1;
    }
    last_value = value;
    switch (value) {
      case 0:
        puts("Saved environment.");
        jump(0);
      default:
        printf("Jumped to %d.\n", value);
        if (value < 10)
          jump(value + 1);
    }
  }

  if (!lose && value == 10) {
    /* And again for the `_setjmp' function.  */
#ifndef _setjmp
    extern int _setjmp(jmp_buf);
#endif
    last_value = -1;
    lose = 0;

    value = _setjmp(env);
    if (value != last_value + 1) {
      fputs("Shouldn't have ", stdout);
      lose = 1;
    }
    last_value = value;
    switch (value) {
      case 0:
        puts("Saved environment.");
        jump(0);
      default:
        printf("Jumped to %d.\n", value);
        if (value < 10)
          jump(value + 1);
    }
  }

  if (lose || value != 10)
    puts("Test FAILED!");
  else
    puts("Test succeeded!");

  return lose ? EXIT_FAILURE : EXIT_SUCCESS;
}
